Which German steam locomotive reached 200.4 km/h in 1936?

DRG Class 05 002 reached 200.4 km/h in 1936.

The locomotive achieved that speed on 11 May 1936 during a test run on the Berlin–Hamburg railway, hauling a 197-ton train. Its 200.4 km/h run established a world speed record for steam locomotives and demonstrated how far streamlined steam power had advanced in prewar Germany.

The Class 05 was built by Borsig for the Deutsche Reichsbahn in response to the success of high-speed diesel trains such as the Flying Hamburger. Three locomotives were produced: 05 001 and 05 002 had conventional streamlined layouts, while 05 003 was built with a cab-forward arrangement.

The record belonged specifically to 05 002, not to the entire class indiscriminately. It held the steam speed record until 1938, when Britain's LNER A4 No. 4468 Mallard surpassed it. Mallard's run reached 126 mph, or about 202.8 km/h, on a slight downhill section and remains the better-known record.